This is the same person as Edmund Rockwell. He tested Element on many subjects ( that’s how Nameless and Reapers came ) and got greedy of their power and injected himself with it, turning him into the final boss. He destroyed the city’s ( how ruins came to be ) and Helena and Mei-Yin were forced to shove him into a hole and trap him. Helena, now depressed, held a funeral for Rockwell. That’s the story of how this horrid creature came to be.